US4712945A - System for sealing barrier constructions in subterranean galleries - Google Patents

System for sealing barrier constructions in subterranean galleries Download PDF

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Publication number
US4712945A
US4712945A US06/758,214 US75821485A US4712945A US 4712945 A US4712945 A US 4712945A US 75821485 A US75821485 A US 75821485A US 4712945 A US4712945 A US 4712945A
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Prior art keywords
accordance
medium
pressure
gallery
sealing
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US06/758,214
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English (en)
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Christian Schrimpf
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DEUTSCHE Gesellschaft ZUM BAU und BETRIEB VON ENDLAGERN fur ABFALLSTOFFE MGH A CORP OF FED REP OF GERMANY
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LEINE AND KONIG
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Assigned to Leine & Konig reassignment Leine & Konig ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCHRIMPF, CHRISTIAN
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Assigned to DEUTSCHE GESELLCHAFT ZUM BAU UND BETRIEB VON ENDLAGERN FUR ABFALLSTOFFE MGH, A CORP. OF THE FED. REP. OF GERMANY reassignment DEUTSCHE GESELLCHAFT ZUM BAU UND BETRIEB VON ENDLAGERN FUR ABFALLSTOFFE MGH, A CORP. OF THE FED. REP. OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: LEINE, E., KONIG
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/103—Dams, e.g. for ventilation

Definitions

  • the invention concerns a process and a device for sealing barrier constructions in subterranean galleries, especially in salt mines.
  • Additional sealing elements may be either a ring seal, for sealing the contact zone on the circumference of the barrier body, or a surface seal, for sealing the entire cross-section, including the contact zone.
  • seals As to the physical contact mechanism of the sealing medium, there are different types of seals. Some seals use the pure adhesion effect and other seals use the overpressure effect.
  • the sealing agent may hold and seal in a solid form, such as, for example, bitumen or plastic tracks and/or metal foils.
  • the seals may also hold and seal in plastic to viscous form, such as, for example, clay, bitumen, or a sand asphalt.
  • Such seals hold and seal by means of adhesion effects to the, and its own substance tightness between the, impermeable static solid bodies to be sealed. Differential movements between barrier bodies and mines as a consequence of the static load absorption and load diminution through the blocking construction can impair the adhesive sealing effect. Thus, local or zonal mechanical overstressings of the (originally tight) static support impair the effect of sealing.
  • sealing systems Under high mechanical stressing, high fluid pressure, or steep pressure gradients, as well as under strong deformations or differential movements under loads, sealing systems may work in a purely adhesive manner. Such sealing systems can therefore lose their effectiveness under the influence of different damage mechanisms.
  • the sealing media stand in solid form, such as, for example, bitumen, under overpressure relative to the pressure of the sealing, fluid, or gaseous stressing medium. This overpressure prevents the penetration of the medium into the contact joints. Adhesion properties of the sealing material may also support this sealing mechanism.
  • the overpressure of this type of sealing relative to the pressure of the media to be sealed can be produced through mechanically working elements, such as, for example, hydraulic cylinders, hydrostatic overpressure effects, and physical-chemical effects, through sources under overpressure.
  • DE-PS No. 195 434 depicts a barrier seal, especially for salt mines, in which the shaft or the gallery is covered before the barrier door with tubbing or brickwork.
  • the barrier door itself lies with its frame against a wedging collar.
  • the sealing in the contact area between the wedging collar and the mine is accomplished through picotages.
  • the space between the tubbing and the mine is filled up with cement.
  • air chambers are formed which are provided as support and pressing chambers, and allow checking of the value and reliability of the seal or the sealing between the cement and the mine.
  • the chambers can be filled with cement in order to again produce a flawless sealing.
  • DD-PS No. 135 103 concerns a process for sealing galleries in soluble mine layers. There is positioned before the static support a hollow space section with material which is inert relative to the salt mine (for example, bitumen), and then buffer lye, which is supersaturated relative to the salt mine. Convection and diffusion are kept slight through the filling out of the hollow, cross-sectional space with heaps of debris and blocking walls, and with displaced openings. The possibility of saturation exists with the unsaturated lye.
  • an overpressure space which is filled with a material (silicon oil) which is inert relative to the mine and the bitumen, a penetration of the lye into the area of the sealing packagings is impeded, as long as the overpressure can be maintained.
  • pressure measurements, sample extractions, and extrusion of buffer lye are undertaken through pipe tubings, and extrusions are carried out, and an overpressure relative to the lye pressure is produced.
  • a long hollow space section with a thrust space insulation is provided. This is not completely brought forward to the static support, so that the possibility of sealing the extruding mine area does not occur in the sealing medium.
  • the insulation In order to impede or limit the backcreeping of the thrust insulation, the insulation is bound several times in radially running direction slits, which are extruded with plastic. It is disadvantageous that the overpressure in the sealing system must always be adjusted to the pressure of the standing interference media. Such adjustments require the aid of pumps, which are not maintenance-free, cannot maintain the necessary pressure, and cannot be used as long as the barrier is accessible from one side.
  • An object of the present invention is an improved system for sealing barrier constructions in subterranean galleries, especially in salt mines. Another object is a process and device of the type already stated that attains, both for normal loads, as well as pressure loads, a self-operating and maintenance-free sealing, with a very long life span.
  • a fluid sealing medium is filled into a hollow space and is maintained at overpressure relative to the pressure of a stressing medium.
  • the present invention further relates to a device for sealing such barrier constructions.
  • a hollow space is filled with a sealing medium, maintained below overpressure, and positioned between the part of the gallery to be protected and the part of the galley in which a stressing medium is present.
  • the process and the device should be so constructed that a maintenance-free and self-operating sealing is attained for any load level.
  • the sealing medium is stressed with a preset pressure and at the pressure of the stressing medium.
  • the hollow space has a pressure shaft, in which the sealing medium stands at a predetermined level.
  • the part of which is located above the level of the sealing medium is connected with the gallery in which the stressing medium stands. Through this, it is ensured that a specific overpressure is always present in the hollow space. Losses of sealing medium are independently compensated through the column of sealing medium in the pressure shaft, which represents a supply of pressure medium.
  • a sealing medium overpressure is always present relative to pressure stressings of a stressing medium (fluid and/or gas), as well as, in the case of lower as well as higher pressure stressing, through the stressing medium.
  • the pressure in the sealing system between the pressure shaft and the stressing medium changes directly with the pressure of the stressing medium, so that an adequate overpressure which is always self-regulating is adjusted.
  • the use of pumps is superfluous.
  • the overpressure provided can therefore be maintained for long periods. Losses of sealing medium, for example, through displacement of support, the formation of cracks, and so forth, which are also still favored through temperature-controlled reactions of viscosity, can then independently be compensated for.
  • FIG. 1 is a schematic showing a first preferred embodiment of the present invention with a variant depicted by dotted lines;
  • FIG. 2 is a schematic showing a second preferred embodiment of the invention shown in FIG. 1, with modifications.
  • FIGS. 1 and 2 depicts the device for sealing barrier constructions in subterranean galleries, especially in salt mines.
  • the device includes between a stationary (static) support 2 and an auxiliary barrier 4, a hollow space 6, which is filled with a fluid to viscous sealing medium 7.
  • the device also has a pressure shaft, in which a column of sealing medium 10 stands up to the level of h.
  • the pressure shaft 8 is formed, above, in a closed manner.
  • the static support 2 is located on the side of the hollow space 6 which is turned to the part of the gallery 12 to be protected, and the auxiliary barrier 4 seals the hollow space 6 against the gallery 14 with the stressing medium fluid and/or gas.
  • the static support 2 and auxiliary barrier shall both be referred to herein as primary seals.
  • the part of the pressure shaft which is located above the column of sealing medium 10 is connected, via a connecting boring 16, to the part of the gallery with the stressing medium 14.
  • the static support 2 in accordance with FIG. 1 is constructed as a parallel support which is connected with the mine.
  • the auxiliary barrier is constructed as a parallel barrier which is connected with the mine.
  • Other known transversal forms of the support and of the auxiliary barrier such as the single or multiple truncated conical form, or cogged, etc., are likewise possible.
  • any type of construction is possible which is able to absorb the pressure stresses which appear in the mine and the gasses or fluids, and to displace these to the surrounding mine.
  • FIG. 2 shows, for example, a static support for gas or fluid pressure stressings of approximately 100 bar in four-fold truncated conical construction form, which is connected with the mine in a force-locking or form-locking manner.
  • the support can, for example, have a length of approximately 13 m, and be constructed as a concrete construction form.
  • the auxiliary barrier can, for example, because of the slight pressure stress through the sealing medium, be constructed as a single truncated cone form, and connected in a force-locking or form-locking manner with the mine. It can have, for example, a length of approximately 4 m, and likewise be constructed of concrete.
  • a sliding layer 17 of asphalt plates can be provided between support or auxiliary barrier and the mine.
  • transversal sealings 18 of sand asphalt there can be provided on the hollow space side, both on the static support as well as on the auxiliary barrier, transversal sealings 18 of sand asphalt, as is schematically depicted in FIG. 2.
  • the device depicted in the diagram for the sealing works in the following manner.
  • ⁇ D density of the sealing medium
  • h the level of the column of the sealing medium
  • This overpressure P U also corresponds to the macimal differential pressure over the auxiliary barrier, which is statically exposed to this corresponding differential pressure.
  • overpressure arises which is reduced, relative to the overpressure cited above in equation (1), for the normal load by the hydrostatic pressure of the stressing fluid column with the level h in the connecting boring 16.
  • the overpressure is independent of the level of the fluid pressure in the event of pressure P O , and thus is self-regulating via the auxiliary barrier, differential pressure, or the hollow space 6.
  • This level of overpressure P UL is derived from the equation:
  • ⁇ F the density of the fluid
  • an overpressure is adjusted.
  • the overpressure is reduced, relative to the overpressure in the normal case, without pressure stressing, through a stressing fluid by the hydrostatic pressure yielded from the standing level h F of the fluid in the connecting boring 16:
  • the distance of the discharge of the connecting boring into the pressure shaft for stressing fluid to the level of the sealing medium in the pressure shaft 8 should not be so great that h ⁇ D ⁇ h F ⁇ F .
  • the differential pressure of 0 arises over the auxiliary barrier or an underpressure in the hollow space 6, through which the sealing effect of the sealing device is reduced.
  • sealing medium losses should occur, for example, through displacement of supports in stressing, or through penetration of sealing medium into cracks or the like, so that losses are still caused through temperature-conditioned viscosity reductions, then these are equalized by the column of sealing medium 10.
  • the column of sealing medium 10 forms a supply of sealing medium, which is independently equalized.
  • the sealing device described is therefore especially suited for permanent storage mines, in which increased temperatures form the heat of decomposition must be anticipated. The maintenance of a sealing device is therefore not necessary. This is particularly important under circumstances where a mine is no longer accessible.
  • Fluid to viscous substances such as, for example, bitumen and asphalt, are used as sealing media.
  • Asphalts of standard bitumen and limestone dust filler (density: 1.4 t/m 3 ) or barium sulfate dust filler (density: 2.3 t/m 3 ) are used as sealing media, whereby the desired asphalt density can be adjusted through a corresponding filler additive between the two values named.
  • the density of a saturated salt solution depends on the composition, and can lie within the order of size of 1.35 t/m 3 .
  • the pressure shaft 8 is represented in the diagram as a shaft closed from above. It can be as high as desired, and also be connected with the surface of the earth 11, as indicated by dotted lines in FIG. 1.
  • the pressure shaft can be carved out or can be constructed from a pipe. A casing is especially effective in leading to the surface.
  • the diameter of the pressure shaft can be selected as desired. It is essentially determined through the losses of sealing medium which are anticipated. The influence of the losses of sealing medium on the height of the column of sealing medium h decreases with increasing diameter.
  • the diameter can, for example, amount to 3 m.
  • connection between the pressure shaft 8 and the gallery part 14 can also, as described above, be constructed, apart from the boring 16.
  • Such alternative connections are labels as galleries 20 and shafts 22 and shown in the form of dotted lines in FIG. 2.
  • connection whether constructed as a boring or as a gallery and shaft, can--like the shaft--be either excavated or tubed.
  • connection between the upper part of the pressure shaft and the gallery part 14 can take place outside; through a boring 16; or through a shaft 20 and a gallery 22; or through a pipe connection 24 (depicted by dotted lines in FIG. 2) from the gallery part 14 through the auxiliary barrier 4, through the hollow space 6, and the shaft 8, up to the part of the shaft which is located above the level of the column of sealing medium 10.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Sealing Devices (AREA)
  • Building Environments (AREA)
  • Sealing Material Composition (AREA)
US06/758,214 1984-07-28 1985-07-23 System for sealing barrier constructions in subterranean galleries Expired - Lifetime US4712945A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3427978 1984-07-28
DE3427978A DE3427978C1 (de) 1984-07-28 1984-07-28 Verfahren und Vorrichtung zum Abdichten von Dammbauwerken in untertaegigen Strecken,insbesondere im Salzgebirge

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US4712945A true US4712945A (en) 1987-12-15

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US (1) US4712945A (es)
EP (1) EP0170123B1 (es)
CA (1) CA1233038A (es)
DE (1) DE3427978C1 (es)
ES (1) ES8700383A1 (es)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4842444A (en) * 1987-10-09 1989-06-27 Tusco, Incorporated Method for displacing oxygen from a mine
US7334644B1 (en) * 2007-03-27 2008-02-26 Alden Ozment Method for forming a barrier
US9011043B2 (en) 2010-07-30 2015-04-21 Fci Holdings Delaware, Inc. Engineered mine seal
US20160201460A1 (en) * 2013-08-14 2016-07-14 China Shenhua Energy Company Limited An artificial dam of distributed coal mine underground reservoir and its constructing method
CN116481739A (zh) * 2023-04-20 2023-07-25 徐州中矿岩土技术股份有限公司 一种废弃矿井巷道储气用密封性检测装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10216105C1 (de) * 2002-04-12 2003-06-26 Montan Tech Gmbh Verfahren zur Abdichtung von untertägigen Hohlräumen gegen Gase und Flüssigkeiten im Salzgebirge
DE102006059478B3 (de) * 2006-12-14 2008-02-21 Technische Universität Bergakademie Freiberg Formstabile Blöcke zum Abdichten von Strecken im Salzgestein sowie Einbauverfahren hierfür

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE198375C (es) *
DE195434C (es) *
DE135103C (es) *
US3927719A (en) * 1975-04-25 1975-12-23 Us Interior Remote sealing of mine passages
US3934219A (en) * 1974-09-11 1976-01-20 The United States Of America As Represented By The Secretary Of The Interior Acoustic method and apparatus for determining effectiveness of mine passage seal
US4076312A (en) * 1974-07-29 1978-02-28 Occidental Oil Shale, Inc. Method and apparatus for retorting oil shale at subatmospheric pressure
US4102138A (en) * 1974-06-12 1978-07-25 Bergwerksverband Gmbh Method for closing off a mine gallery especially for use to prevent spreading of underground explosions
US4289354A (en) * 1979-02-23 1981-09-15 Edwin G. Higgins, Jr. Borehole mining of solid mineral resources
US4315657A (en) * 1980-03-17 1982-02-16 Occidental Oil Shale, Inc. Gas seal for an in situ oil shale retort and method of forming thermal barrier

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123977A (en) * 1964-03-10 Blast resistant water door

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE198375C (es) *
DE195434C (es) *
DE135103C (es) *
US4102138A (en) * 1974-06-12 1978-07-25 Bergwerksverband Gmbh Method for closing off a mine gallery especially for use to prevent spreading of underground explosions
US4076312A (en) * 1974-07-29 1978-02-28 Occidental Oil Shale, Inc. Method and apparatus for retorting oil shale at subatmospheric pressure
US3934219A (en) * 1974-09-11 1976-01-20 The United States Of America As Represented By The Secretary Of The Interior Acoustic method and apparatus for determining effectiveness of mine passage seal
US3927719A (en) * 1975-04-25 1975-12-23 Us Interior Remote sealing of mine passages
US4289354A (en) * 1979-02-23 1981-09-15 Edwin G. Higgins, Jr. Borehole mining of solid mineral resources
US4315657A (en) * 1980-03-17 1982-02-16 Occidental Oil Shale, Inc. Gas seal for an in situ oil shale retort and method of forming thermal barrier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4842444A (en) * 1987-10-09 1989-06-27 Tusco, Incorporated Method for displacing oxygen from a mine
US7334644B1 (en) * 2007-03-27 2008-02-26 Alden Ozment Method for forming a barrier
US9011043B2 (en) 2010-07-30 2015-04-21 Fci Holdings Delaware, Inc. Engineered mine seal
US20160201460A1 (en) * 2013-08-14 2016-07-14 China Shenhua Energy Company Limited An artificial dam of distributed coal mine underground reservoir and its constructing method
US9689128B2 (en) * 2013-08-14 2017-06-27 China Shenhua Energy Company Limited Artificial dam of distributed coal mine underground reservoir and its constructing method
CN116481739A (zh) * 2023-04-20 2023-07-25 徐州中矿岩土技术股份有限公司 一种废弃矿井巷道储气用密封性检测装置
CN116481739B (zh) * 2023-04-20 2023-11-14 徐州中矿岩土技术股份有限公司 一种废弃矿井巷道储气用密封性检测装置

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Publication number Publication date
DE3427978C1 (de) 1985-05-15
ES546109A0 (es) 1986-10-16
EP0170123B1 (de) 1988-10-12
CA1233038A (en) 1988-02-23
EP0170123A3 (en) 1986-08-13
ES8700383A1 (es) 1986-10-16
EP0170123A2 (de) 1986-02-05

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